DE3102547A1 - Dish-washing machine - Google Patents

Abstract

The dish-washing machine has a drainage tray (2) made of plastic which is attached to the bottom of the washing container and whose bottom (3) forms housing shapes (4, 6) for the circulation pump (5) and emptying pump (7) attached thereto and which is covered by a fine strainer (17) with a coarse strainer insert (19). For simple construction and energy-saving operation, a drivable control member (11) is provided in a connection branch (9) arranged between the circulation pump and the spraying arms, which control member conducts the washing liquid alternately to the lower and/or upper spraying arm. In this case, the water-conveying channels are likewise integrated in the drainage tray bottom, as is a channel (22) between the pump housings. Non-return valves (23, 24) in this channel (22) or in the discharge nozzle (25) of the emptying pump are closed when the circulation pump is running and open when the emptying pump is running. The drainage tray communicates with the pump housings (4, 6) through apertures (20, 21). <IMAGE>

Description

dishwasher

The invention relates to a dishwasher with a washing container, a drain pan attached to the bottom of the rinsing container, which through a fine sieve with a coarse sieve insert is covered and housing shapes for a circulating 'and a Separate drainage pumps and connections for spray arms form a drainage hose and an air chamber of a level switch.

A dishwasher of this type is known from DE-OS 30 18 526. It is for attaching the motors for those arranged with a horizontal axis Pumps provided a vertical bulkhead on the drain pan, each with a Part of the housing of the pumps is formed in one piece with the transverse wall.

To be fed by a circulation pump in a dishwasher with two Spray arms with reduced water and energy consumption a good cleaning result to achieve a method for cleaning dishes is known (DE-AS 24 2B 991), in which, at least during a wash cycle, the spray arms alternate one after the other are connected to the circulation pump in cycle times and which are based on a spray jet cycle spray arm following a spray jet pause for the duration of the softening of the dirt of the dishes previously sprayed by this spray arm is measured.

In order to avoid that with the one with a smaller amount of water in the rinse tank alternating flushing through the upper resp. lower SDrwoarm vibrations and an annoying noise when controlling the Water flow occur has already been proposed (DE-GM 7 821 866) that the Switching device from one through an inlet connection with the supply lines to the upper and lower spray arm connected housing consists in which on an axis a flap which can be actuated by a control element is pivotably mounted and controls the flow of water diverts from the inlet connection to one of the drain connection, whereby for a steady Transition when closing one waterway and opening the other, the flap forms a bypass in relation to the housing in the area of the inlet connection and that the waterways via the drainage connection through the adjustable control element and can be switched off.

In DE-OS 29 22 442 a control member is proposed which consists of consists of a plate seated on a drivable axis, which has a control slot and rotatably rests against a housing end wall supporting the drainage nozzle, whereby the shape and width of the slot make the control slot opposite the drainage port openings the housing front wall a constant flow regardless of the position of the plate cross section releases.

The invention is based on the object of a dishwasher of the type mentioned in such a way that it is characterized by a simple structure and a good cleaning result even with reduced water and energy consumption can achieve and it works quietly.

This object is achieved according to the invention through the combination of features solved, as indicated in the characterizing part of claim 1.

Appropriate refinements are given in claims 2 and 3.

Through the arrangement of the pumps with their housing shapes, the channels and the control element in the drain pan or on the drain pan bottom are no longer required Walls, housing parts and containers and the result is a very compact machine unit.

The assignment of the pump suction openings to the fine or coarse sieve is important contributes to the good cleaning result, as the circulation pump is running in the coarse sieve accumulated food residues are not crushed by the pump suction and when emptying a main stream of water flowing through the coarse sieve to the emptying pump cleans itself affects the fine sieve and a partial water flow from the circulation pump housing to the drain pump causes the circulation pump housing to be completely emptied. After all, that allows diverting the flow of liquid from the circulation pump to the individual spray arms Control organ the use of a smaller circulation pump and the operation of the dishwasher with smaller amounts of water, without the circulation pump sucking in air and thereby noisy and because of the constant collapse of the spray pressure works little effectively.

In the drawing, the lower washing compartment section of a dishwasher shows in section, an embodiment of the invention is shown.

The dishwasher has a washing container 1 on the bottom a drain pan 2 made of plastic can be attached. The drain pan bottom 3 forms a housing shape 4 for the impeller of a circulation pump 5 and lying somewhat lower a housing shape 6 for the impeller of an evacuation pump 7.

A first channel 8 leads from the circulating pump housing shape 4 List of reference symbols 1 rinsing tank 2 drainage tub 3 drainage base 4 housing shape for 5 5 circulation pump 6 Housing shape for 7 7 Emptying pump 8 Channel 9 Connection branch 10 Spray arm 11 control element 12 pump axis from 5 13 pump axis from 7 14 motor from 5 15 motor of 7 16 motor of 11 17 fine sieve 18 fine sieve cylinder 19 coarse sieve insert 20 opening from 2 to 4 21 opening from 2 to 6 22 duct 23 check valve 24 check valve 25 Pressure connection from 7 26 Connection to the air trap of the level switch 27 Line to lower spray arm 28 line to the upper spray arm to a connection branch 9 for the flow of liquid conveyed by the Umwa'lztuine to the spray arms of the Spray device. Only a lower spray arm 10 is shown in the drawing. In the chamber formed by the connection branch 9 there is a control member 1, as is known from DE-OS 29 22 442. To drive the pumps 5, 7 via the vertical pump axes 12, 13 and of the control element 11 are motors 14, 15, 16 attached to the drain pan bottom 3.

The drain pan 2 is covered by a fine sieve 17, which is easy funnel-shaped merges into a fine sieve cylinder 18 which has a coarse sieve insert 19 wears. Below the fine sieve 17 is a first opening 20 of the Drain pan for the circulating pump housing shape and below the coarse sieve insert 19 there is a second opening 21 from the drain pan to the drain pump housing shape.

This means that when the drain pan is emptied, the shape of the circulating pump is also used 4 is also emptied, a second channel 22 leads from this to the intake port of the Drainage pump. In order to have a partial flow over the channel when the circulation pump 5 is running To prevent 22 to the drain pump 7, a check valve is in this channel 22 23 provided. Another non-return valve 24 in the pressure port 25 of the evacuation pump 7 avoids water flow from the drain pump housing shape when the circulation pump 5 is running 6 through the opening 21 into the blue tub 2.

When the circulation pump is stopped and the drain pump is running, the Check valves 23, 24 open. A connector molded onto the drain pan 2 26 leads to an air trap, not shown, of a level switch. The administration 27 leads from the junction 9 to the lower spray arm 10 and the line 28 to an upper spray arm and / or to one arranged under the washing compartment lid Shower or similar

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Claims (3)

Claims dishwasher with a washing container, one on the washing container base attached drain pan, which is covered by a fine sieve with a coarse sieve insert is as well as housing shapes for a circulation pump and a drainage pump that is separate from it forms and connections for spray arms, an emptying hose and an air chamber of a level switch, characterized in that the pumps (5, 7) are vertical Have axes (12, 13) and their motors (14, 15) attached to the drain pan bottom (3) are that the drain pan (2) openings (20, 21) to the housing shapes (4, 6) of the Pumps has that over the opening (20) to the circulating pump housing shape (4) the fine sieve (17) and above the opening (21) to the drain pump housing shape (6) the coarse sieve insert (19) is that of the circulating pump housing form a channel (8) to a junction (9) to the spray arms leads in the one the flow of liquid from the circulation pump in the lower and / or in the upper spray arm deflecting control element (11) is arranged that from the circulating pump housing form a channel (22) to the evacuation pump leads in which a check valve (23) is arranged and that another check valve (24) provided in the pressure port (25) of the drainage pump in front of the drainage hose is. 2. Dishwasher according to claim 1, characterized in that that for the drive of the control member (11) on the drain pan bottom (3) a gear is attached to the motor (16). 3. Dishwasher according to claim 1, characterized in that that the shape of the housing (6) of the drain pump (7) deeper than that the circulation pump (5) is arranged in the drain pan (2) and that the check valves (23, 24) closed when the circulation pump is running, when the circulation pump is stopped and running The drain pump are open.